SOLUTION: u and v are unit vectors and the angle is pi/3 What is ||3u + 4v||? My book gives the answer {{{sqrt(37)}}} and I have the same result but I would like to know if I have done it

Algebra ->  College  -> Linear Algebra -> SOLUTION: u and v are unit vectors and the angle is pi/3 What is ||3u + 4v||? My book gives the answer {{{sqrt(37)}}} and I have the same result but I would like to know if I have done it       Log On


   

Question 1183418: u and v are unit vectors and the angle is pi/3
What is ||3u + 4v||?
My book gives the answer sqrt%2837%29 and I have the same result but I would like to know if I have done it correct.
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
, since u and v are unit vectors.
= .
Hence abs%283u+%2B+4v%29%5E2+=+37, which implies that abs%283u%2B4v%29+=+sqrt%2837%29.